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Author Topic: 40' flagpole as a vertical antenna  (Read 975 times)
KG7ALA
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Posts: 2




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« on: January 18, 2013, 02:55:58 PM »

I have a 40' self-supporting steel flagpole (8" tapering to 4") and am wondering if it could somehow be utilized as a permanent vertical antenna? Needless to say, it would need to be insulated at the base from ground.
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K2OWK
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Posts: 1045




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« Reply #1 on: January 18, 2013, 04:32:06 PM »

It should work fine. As you stated it would have to be insulated from ground, and a minimum of 16 ground radials installed. It will also require an antenna tuner.

73s

K2OWK
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KG4RUL
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« Reply #2 on: January 18, 2013, 05:57:42 PM »

I have a 41' flagpole with a remote auto-tuner at the base and 12 radials of varying lengths.  No problem getting <2:1 SWR on all bands from 160-6m.
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K6JH
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Posts: 42




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« Reply #3 on: January 18, 2013, 06:00:07 PM »

Yup. It is very possible to shunt feed the flag pole if the base is grounded. Lots of hams shunt feed their towers.

An example of a flag pole:
http://www.arrl.org/news/the-field-day-flag-pole-vertical
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KG7ALA
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Posts: 2




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« Reply #4 on: January 18, 2013, 07:40:56 PM »

Thank you guys for all the help ... and especially to Jim (K6JH) for the very informative link.

'73's

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ZENKI
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Posts: 916




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« Reply #5 on: January 19, 2013, 12:48:04 AM »

What I would do is also add some parallel vertical wires or elements  to the flagpole to give a better  radiation pattern on the higher bands. 40ft verticals have a rather high radiation angles above 20 meters.
I would at least a 1/4 wave wire for 17 and 15 meters since these are good reliable bands that require a favorable take-off angle.
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